<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>动画菜单</title>
<style type="text/css">
* { margin: 0; padding: 0; font-size: 14px; }
a { color: #333; text-decoration: none }
ul{ list-style: none; }
.nav {height: 30px; border-bottom: 5px solid #F60; margin-left:50px; width:600px;}
.nav li { float: left; position:relative; height:30px; width:120px }
.nav li a { display: block; height: 30px; text-align: center; line-height: 30px; width:120px; background: #efefef; margin-left: 1px; }
.subNav{ position:absolute; top:30px; left:0; width:120px; height:0; /*overflow:hidden*/ display:none;}
.subNav li a{ background:#ddd }
.subNav li a:hover{ background:#efefef}
</style>
<script>
window.onload=function(){
    var aLi=document.getElementsByTagName('li');
	for(var i=0; i<aLi.length; i++){
		aLi[i].onmouseover=function(){
            //鼠标经过一级菜单，二级菜单动画下拉显示出来
	      // var _this = this;
        var childNodes = this.childNodes;
          if(childNodes[2]){
            childNodes[2].style.display="block";
          }
		}
        //鼠标离开菜单，二级菜单动画收缩起来。		
		aLi[i].onmouseout=function(){
		var childNodes = this.childNodes;
          if(childNodes[2]){
            childNodes[2].style.display="none";
          }
		}	
	}
}
</script>
</head>
<body>
<ul class="nav">
    <li><a href="#">一级菜单</a>
    	<ul class="subNav">
        	<li><a href="#">二级菜单</a></li>
            <li><a href="#">二级菜单</a></li>
            <li><a href="#">二级菜单</a></li>
            <li><a href="#">二级菜单</a></li>
        </ul>
    </li>
    <li><a href="#">一级菜单</a>
    	<ul class="subNav">
        	<li><a href="#">二级菜单</a></li>
            <li><a href="#">二级菜单</a></li>
            <li><a href="#">二级菜单</a></li>
            <li><a href="#">二级菜单</a></li>
        </ul>
    </li>
    <li><a href="#">一级菜单</a></li>
    <li><a href="#">一级菜单</a></li>
    <li><a href="#">一级菜单</a></li>
</ul>
</body>
</html>